Added readme and license

LICENSE.txt

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+Copyright 2018 Rick Rongen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.MD

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+# grpkill
+
+A linux command to kill a specific process.
+
+It will only kill when the all the following criteria are met:
+
+ - The current user is in the same group as the egid of grpkill
+ - The process to kill has the same gid as the egid of grpkill
+
+grpkill will also fail when:
+
+ - The argument count is not equal to 2
+ - The first argument is not an integer
+
+## License
+This project is licensed under the MIT license. You may copy and modify it to your liking. But may not sell it.
+
+I am not responsible for processes being killed that shouldn't have been killed ;)